It disassembles in the native mode component which obtains the error magnetic field distribution which it measures with singular value decomposition the shim tray (5) it arranges on combining the iron one arrangement which corresponds to each mode. As for the native mode which it revises reachable magnetic field precision (the appropriateness of the uniformity coefficient) with iron one arrangement quantity with it selects. While the magnetic field precision which it can arrive (uniformity coefficient) grasping because you can adjust, be able to grasp also the adjustment which you are wrong, in addition while repeatedly adjusting, it can revise automatically. With the method due to this invention and when with the support by the device which builds in this method, magnetic field adjustment is done magnetic field adjustment securely, it keeps completing in repetitive job. As a result the device whose magnetic field precision is good can be offered. In addition reachable uniformity coefficient (17) by the fact that you inspect, there is also a feature which early can inspect the defective magnet.計測した誤差磁場分布を特異値分解により得た固有モード成分に分解し、各モードに対応した鉄片配置を組み合わせてシムトレイ(5)上に配置する。補正する固有モードは到達可能な磁場精度(均一度)と鉄片配置量の適切さで選択する。到達できる磁場精度(均一度)を把握しながら調整できるので、間違った調整も把握でき、また繰り返し調整する中で自動的に補正できる。本発明による方法でまたこの方法を内蔵した装置による支援で、磁場調整を行うと確実に磁場調整が繰り返し作業の中で完了していく。その結果磁場精度の良い装置を提供できる。また到達可能均一度(17)を調べることで、不良な磁石を早期に検知できる特徴もある。
